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format-subunit: Hide reason if it is None.
[Samba/eduardoll.git] / source3 / smbd / service.c
blob36184af75c6174a6d7e119613e479c193ca0daff
1 /*
2 Unix SMB/CIFS implementation.
3 service (connection) opening and closing
4 Copyright (C) Andrew Tridgell 1992-1998
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "includes.h"
21 #include "smbd/globals.h"
22
23 extern userdom_struct current_user_info;
24
25 static bool canonicalize_connect_path(connection_struct *conn)
26 {
27 #ifdef REALPATH_TAKES_NULL
28 bool ret;
29 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,NULL);
30 if (!resolved_name) {
31 return false;
32 }
33 ret = set_conn_connectpath(conn,resolved_name);
34 SAFE_FREE(resolved_name);
35 return ret;
36 #else
37 char resolved_name_buf[PATH_MAX+1];
38 char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,resolved_name_buf);
39 if (!resolved_name) {
40 return false;
41 }
42 return set_conn_connectpath(conn,resolved_name);
43 #endif /* REALPATH_TAKES_NULL */
44 }
45
46 /****************************************************************************
47 Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
48 absolute path stating in / and not ending in /.
49 Observent people will notice a similarity between this and check_path_syntax :-).
50 ****************************************************************************/
51
52 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
53 {
54 char *destname;
55 char *d;
56 const char *s = connectpath;
57 bool start_of_name_component = true;
58
59 if (connectpath == NULL || connectpath[0] == '\0') {
60 return false;
61 }
62
63 /* Allocate for strlen + '\0' + possible leading '/' */
64 destname = (char *)SMB_MALLOC(strlen(connectpath) + 2);
65 if (!destname) {
66 return false;
67 }
68 d = destname;
69
70 *d++ = '/'; /* Always start with root. */
71
72 while (*s) {
73 if (*s == '/') {
74 /* Eat multiple '/' */
75 while (*s == '/') {
76 s++;
77 }
78 if ((d > destname + 1) && (*s != '\0')) {
79 *d++ = '/';
80 }
81 start_of_name_component = True;
82 continue;
83 }
84
85 if (start_of_name_component) {
86 if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
87 /* Uh oh - "/../" or "/..\0" ! */
88
89 /* Go past the ../ or .. */
90 if (s[2] == '/') {
91 s += 3;
92 } else {
93 s += 2; /* Go past the .. */
94 }
95
96 /* If we just added a '/' - delete it */
97 if ((d > destname) && (*(d-1) == '/')) {
98 *(d-1) = '\0';
99 d--;
100 }
101
102 /* Are we at the start ? Can't go back further if so. */
103 if (d <= destname) {
104 *d++ = '/'; /* Can't delete root */
105 continue;
106 }
107 /* Go back one level... */
108 /* Decrement d first as d points to the *next* char to write into. */
109 for (d--; d > destname; d--) {
110 if (*d == '/') {
111 break;
112 }
113 }
114 /* We're still at the start of a name component, just the previous one. */
115 continue;
116 } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
117 /* Component of pathname can't be "." only - skip the '.' . */
118 if (s[1] == '/') {
119 s += 2;
120 } else {
121 s++;
122 }
123 continue;
124 }
125 }
126
127 if (!(*s & 0x80)) {
128 *d++ = *s++;
129 } else {
130 size_t siz;
131 /* Get the size of the next MB character. */
132 next_codepoint(s,&siz);
133 switch(siz) {
134 case 5:
135 *d++ = *s++;
136 /*fall through*/
137 case 4:
138 *d++ = *s++;
139 /*fall through*/
140 case 3:
141 *d++ = *s++;
142 /*fall through*/
143 case 2:
144 *d++ = *s++;
145 /*fall through*/
146 case 1:
147 *d++ = *s++;
148 break;
149 default:
150 break;
151 }
152 }
153 start_of_name_component = false;
154 }
155 *d = '\0';
156
157 /* And must not end in '/' */
158 if (d > destname + 1 && (*(d-1) == '/')) {
159 *(d-1) = '\0';
160 }
161
162 DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
163 lp_servicename(SNUM(conn)), destname ));
164
165 string_set(&conn->connectpath, destname);
166 SAFE_FREE(destname);
167 return true;
168 }
169
170 /****************************************************************************
171 Load parameters specific to a connection/service.
172 ****************************************************************************/
173
174 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
175 {
176 int snum;
177
178 if (!conn) {
179 last_conn = NULL;
180 return(False);
181 }
182
183 conn->lastused_count++;
184
185 snum = SNUM(conn);
186
187 if (do_chdir &&
188 vfs_ChDir(conn,conn->connectpath) != 0 &&
189 vfs_ChDir(conn,conn->origpath) != 0) {
190 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
191 conn->connectpath, strerror(errno)));
192 return(False);
193 }
194
195 if ((conn == last_conn) && (last_flags == flags)) {
196 return(True);
197 }
198
199 last_conn = conn;
200 last_flags = flags;
201
202 /* Obey the client case sensitivity requests - only for clients that support it. */
203 switch (lp_casesensitive(snum)) {
204 case Auto:
205 {
206 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
207 enum remote_arch_types ra_type = get_remote_arch();
208 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
209 /* Client can't support per-packet case sensitive pathnames. */
210 conn->case_sensitive = False;
211 } else {
212 conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
213 }
214 }
215 break;
216 case True:
217 conn->case_sensitive = True;
218 break;
219 default:
220 conn->case_sensitive = False;
221 break;
222 }
223 return(True);
224 }
225
226 static int load_registry_service(const char *servicename)
227 {
228 if (!lp_registry_shares()) {
229 return -1;
230 }
231
232 if ((servicename == NULL) || (*servicename == '\0')) {
233 return -1;
234 }
235
236 if (strequal(servicename, GLOBAL_NAME)) {
237 return -2;
238 }
239
240 if (!process_registry_service(servicename)) {
241 return -1;
242 }
243
244 return lp_servicenumber(servicename);
245 }
246
247 void load_registry_shares(void)
248 {
249 DEBUG(8, ("load_registry_shares()\n"));
250 if (!lp_registry_shares()) {
251 return;
252 }
253
254 process_registry_shares();
255
256 return;
257 }
258
259 /****************************************************************************
260 Add a home service. Returns the new service number or -1 if fail.
261 ****************************************************************************/
262
263 int add_home_service(const char *service, const char *username, const char *homedir)
264 {
265 int iHomeService;
266
267 if (!service || !homedir || homedir[0] == '\0')
268 return -1;
269
270 if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
271 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
272 return -1;
273 }
274 }
275
276 /*
277 * If this is a winbindd provided username, remove
278 * the domain component before adding the service.
279 * Log a warning if the "path=" parameter does not
280 * include any macros.
281 */
282
283 {
284 const char *p = strchr(service,*lp_winbind_separator());
285
286 /* We only want the 'user' part of the string */
287 if (p) {
288 service = p + 1;
289 }
290 }
291
292 if (!lp_add_home(service, iHomeService, username, homedir)) {
293 return -1;
294 }
295
296 return lp_servicenumber(service);
297
298 }
299
300 /**
301 * Find a service entry.
302 *
303 * @param service is modified (to canonical form??)
304 **/
305
306 int find_service(fstring service)
307 {
308 int iService;
309 struct smbd_server_connection *sconn = smbd_server_conn;
310
311 all_string_sub(service,"\\","/",0);
312
313 iService = lp_servicenumber(service);
314
315 /* now handle the special case of a home directory */
316 if (iService < 0) {
317 char *phome_dir = get_user_home_dir(talloc_tos(), service);
318
319 if(!phome_dir) {
320 /*
321 * Try mapping the servicename, it may
322 * be a Windows to unix mapped user name.
323 */
324 if(map_username(sconn, service))
325 phome_dir = get_user_home_dir(
326 talloc_tos(), service);
327 }
328
329 DEBUG(3,("checking for home directory %s gave %s\n",service,
330 phome_dir?phome_dir:"(NULL)"));
331
332 iService = add_home_service(service,service /* 'username' */, phome_dir);
333 }
334
335 /* If we still don't have a service, attempt to add it as a printer. */
336 if (iService < 0) {
337 int iPrinterService;
338
339 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
340 iPrinterService = load_registry_service(PRINTERS_NAME);
341 }
342 if (iPrinterService >= 0) {
343 DEBUG(3,("checking whether %s is a valid printer name...\n", service));
344 if (pcap_printername_ok(service)) {
345 DEBUG(3,("%s is a valid printer name\n", service));
346 DEBUG(3,("adding %s as a printer service\n", service));
347 lp_add_printer(service, iPrinterService);
348 iService = lp_servicenumber(service);
349 if (iService < 0) {
350 DEBUG(0,("failed to add %s as a printer service!\n", service));
351 }
352 } else {
353 DEBUG(3,("%s is not a valid printer name\n", service));
354 }
355 }
356 }
357
358 /* Check for default vfs service? Unsure whether to implement this */
359 if (iService < 0) {
360 }
361
362 if (iService < 0) {
363 iService = load_registry_service(service);
364 }
365
366 /* Is it a usershare service ? */
367 if (iService < 0 && *lp_usershare_path()) {
368 /* Ensure the name is canonicalized. */
369 strlower_m(service);
370 iService = load_usershare_service(service);
371 }
372
373 /* just possibly it's a default service? */
374 if (iService < 0) {
375 char *pdefservice = lp_defaultservice();
376 if (pdefservice && *pdefservice && !strequal(pdefservice,service) && !strstr_m(service,"..")) {
377 /*
378 * We need to do a local copy here as lp_defaultservice()
379 * returns one of the rotating lp_string buffers that
380 * could get overwritten by the recursive find_service() call
381 * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
382 */
383 char *defservice = SMB_STRDUP(pdefservice);
384
385 if (!defservice) {
386 goto fail;
387 }
388
389 /* Disallow anything except explicit share names. */
390 if (strequal(defservice,HOMES_NAME) ||
391 strequal(defservice, PRINTERS_NAME) ||
392 strequal(defservice, "IPC$")) {
393 SAFE_FREE(defservice);
394 goto fail;
395 }
396
397 iService = find_service(defservice);
398 if (iService >= 0) {
399 all_string_sub(service, "_","/",0);
400 iService = lp_add_service(service, iService);
401 }
402 SAFE_FREE(defservice);
403 }
404 }
405
406 if (iService >= 0) {
407 if (!VALID_SNUM(iService)) {
408 DEBUG(0,("Invalid snum %d for %s\n",iService, service));
409 iService = -1;
410 }
411 }
412
413 fail:
414
415 if (iService < 0)
416 DEBUG(3,("find_service() failed to find service %s\n", service));
417
418 return (iService);
419 }
420
421
422 /****************************************************************************
423 do some basic sainity checks on the share.
424 This function modifies dev, ecode.
425 ****************************************************************************/
426
427 static NTSTATUS share_sanity_checks(int snum, fstring dev)
428 {
429
430 if (!lp_snum_ok(snum) ||
431 !check_access(smbd_server_fd(),
432 lp_hostsallow(snum), lp_hostsdeny(snum))) {
433 return NT_STATUS_ACCESS_DENIED;
434 }
435
436 if (dev[0] == '?' || !dev[0]) {
437 if (lp_print_ok(snum)) {
438 fstrcpy(dev,"LPT1:");
439 } else if (strequal(lp_fstype(snum), "IPC")) {
440 fstrcpy(dev, "IPC");
441 } else {
442 fstrcpy(dev,"A:");
443 }
444 }
445
446 strupper_m(dev);
447
448 if (lp_print_ok(snum)) {
449 if (!strequal(dev, "LPT1:")) {
450 return NT_STATUS_BAD_DEVICE_TYPE;
451 }
452 } else if (strequal(lp_fstype(snum), "IPC")) {
453 if (!strequal(dev, "IPC")) {
454 return NT_STATUS_BAD_DEVICE_TYPE;
455 }
456 } else if (!strequal(dev, "A:")) {
457 return NT_STATUS_BAD_DEVICE_TYPE;
458 }
459
460 /* Behave as a printer if we are supposed to */
461 if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
462 fstrcpy(dev, "LPT1:");
463 }
464
465 return NT_STATUS_OK;
466 }
467
468 /*
469 * Go through lookup_name etc to find the force'd group.
470 *
471 * Create a new token from src_token, replacing the primary group sid with the
472 * one found.
473 */
474
475 static NTSTATUS find_forced_group(bool force_user,
476 int snum, const char *username,
477 DOM_SID *pgroup_sid,
478 gid_t *pgid)
479 {
480 NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
481 TALLOC_CTX *frame = talloc_stackframe();
482 DOM_SID group_sid;
483 enum lsa_SidType type;
484 char *groupname;
485 bool user_must_be_member = False;
486 gid_t gid;
487
488 groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
489 if (groupname == NULL) {
490 DEBUG(1, ("talloc_strdup failed\n"));
491 result = NT_STATUS_NO_MEMORY;
492 goto done;
493 }
494
495 if (groupname[0] == '+') {
496 user_must_be_member = True;
497 groupname += 1;
498 }
499
500 groupname = talloc_string_sub(talloc_tos(), groupname,
501 "%S", lp_servicename(snum));
502 if (groupname == NULL) {
503 DEBUG(1, ("talloc_string_sub failed\n"));
504 result = NT_STATUS_NO_MEMORY;
505 goto done;
506 }
507
508 if (!lookup_name_smbconf(talloc_tos(), groupname,
509 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
510 NULL, NULL, &group_sid, &type)) {
511 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
512 groupname));
513 goto done;
514 }
515
516 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
517 (type != SID_NAME_WKN_GRP)) {
518 DEBUG(10, ("%s is a %s, not a group\n", groupname,
519 sid_type_lookup(type)));
520 goto done;
521 }
522
523 if (!sid_to_gid(&group_sid, &gid)) {
524 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
525 sid_string_dbg(&group_sid), groupname));
526 goto done;
527 }
528
529 /*
530 * If the user has been forced and the forced group starts with a '+',
531 * then we only set the group to be the forced group if the forced
532 * user is a member of that group. Otherwise, the meaning of the '+'
533 * would be ignored.
534 */
535
536 if (force_user && user_must_be_member) {
537 if (user_in_group_sid(username, &group_sid)) {
538 sid_copy(pgroup_sid, &group_sid);
539 *pgid = gid;
540 DEBUG(3,("Forced group %s for member %s\n",
541 groupname, username));
542 } else {
543 DEBUG(0,("find_forced_group: forced user %s is not a member "
544 "of forced group %s. Disallowing access.\n",
545 username, groupname ));
546 result = NT_STATUS_MEMBER_NOT_IN_GROUP;
547 goto done;
548 }
549 } else {
550 sid_copy(pgroup_sid, &group_sid);
551 *pgid = gid;
552 DEBUG(3,("Forced group %s\n", groupname));
553 }
554
555 result = NT_STATUS_OK;
556 done:
557 TALLOC_FREE(frame);
558 return result;
559 }
560
561 /****************************************************************************
562 Create an auth_serversupplied_info structure for a connection_struct
563 ****************************************************************************/
564
565 static NTSTATUS create_connection_server_info(struct smbd_server_connection *sconn,
566 TALLOC_CTX *mem_ctx, int snum,
567 struct auth_serversupplied_info *vuid_serverinfo,
568 DATA_BLOB password,
569 struct auth_serversupplied_info **presult)
570 {
571 if (lp_guest_only(snum)) {
572 return make_server_info_guest(mem_ctx, presult);
573 }
574
575 if (vuid_serverinfo != NULL) {
576
577 struct auth_serversupplied_info *result;
578
579 /*
580 * This is the normal security != share case where we have a
581 * valid vuid from the session setup. */
582
583 if (vuid_serverinfo->guest) {
584 if (!lp_guest_ok(snum)) {
585 DEBUG(2, ("guest user (from session setup) "
586 "not permitted to access this share "
587 "(%s)\n", lp_servicename(snum)));
588 return NT_STATUS_ACCESS_DENIED;
589 }
590 } else {
591 if (!user_ok_token(vuid_serverinfo->unix_name,
592 pdb_get_domain(vuid_serverinfo->sam_account),
593 vuid_serverinfo->ptok, snum)) {
594 DEBUG(2, ("user '%s' (from session setup) not "
595 "permitted to access this share "
596 "(%s)\n",
597 vuid_serverinfo->unix_name,
598 lp_servicename(snum)));
599 return NT_STATUS_ACCESS_DENIED;
600 }
601 }
602
603 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
604 if (result == NULL) {
605 return NT_STATUS_NO_MEMORY;
606 }
607
608 *presult = result;
609 return NT_STATUS_OK;
610 }
611
612 if (lp_security() == SEC_SHARE) {
613
614 fstring user;
615 bool guest;
616
617 /* add the sharename as a possible user name if we
618 are in share mode security */
619
620 add_session_user(sconn, lp_servicename(snum));
621
622 /* shall we let them in? */
623
624 if (!authorise_login(sconn, snum,user,password,&guest)) {
625 DEBUG( 2, ( "Invalid username/password for [%s]\n",
626 lp_servicename(snum)) );
627 return NT_STATUS_WRONG_PASSWORD;
628 }
629
630 return make_serverinfo_from_username(mem_ctx, user, guest,
631 presult);
632 }
633
634 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
635 return NT_STATUS_ACCESS_DENIED;
636 }
637
638
639 /****************************************************************************
640 Make a connection, given the snum to connect to, and the vuser of the
641 connecting user if appropriate.
642 ****************************************************************************/
643
644 connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
645 int snum, user_struct *vuser,
646 DATA_BLOB password,
647 const char *pdev,
648 NTSTATUS *pstatus)
649 {
650 connection_struct *conn = NULL;
651 struct smb_filename *smb_fname_cpath = NULL;
652 fstring dev;
653 int ret;
654 char addr[INET6_ADDRSTRLEN];
655 bool on_err_call_dis_hook = false;
656 bool claimed_connection = false;
657 uid_t effuid;
658 gid_t effgid;
659 NTSTATUS status;
660
661 fstrcpy(dev, pdev);
662
663 if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
664 goto err_root_exit;
665 }
666
667 conn = conn_new(sconn);
668 if (!conn) {
669 DEBUG(0,("Couldn't find free connection.\n"));
670 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
671 goto err_root_exit;
672 }
673
674 conn->params->service = snum;
675
676 status = create_connection_server_info(sconn,
677 conn, snum, vuser ? vuser->server_info : NULL, password,
678 &conn->server_info);
679
680 if (!NT_STATUS_IS_OK(status)) {
681 DEBUG(1, ("create_connection_server_info failed: %s\n",
682 nt_errstr(status)));
683 *pstatus = status;
684 goto err_root_exit;
685 }
686
687 if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
688 conn->force_user = true;
689 }
690
691 add_session_user(sconn, conn->server_info->unix_name);
692
693 safe_strcpy(conn->client_address,
694 client_addr(get_client_fd(),addr,sizeof(addr)),
695 sizeof(conn->client_address)-1);
696 conn->num_files_open = 0;
697 conn->lastused = conn->lastused_count = time(NULL);
698 conn->used = True;
699 conn->printer = (strncmp(dev,"LPT",3) == 0);
700 conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
701 ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
702
703 /* Case options for the share. */
704 if (lp_casesensitive(snum) == Auto) {
705 /* We will be setting this per packet. Set to be case
706 * insensitive for now. */
707 conn->case_sensitive = False;
708 } else {
709 conn->case_sensitive = (bool)lp_casesensitive(snum);
710 }
711
712 conn->case_preserve = lp_preservecase(snum);
713 conn->short_case_preserve = lp_shortpreservecase(snum);
714
715 conn->encrypt_level = lp_smb_encrypt(snum);
716
717 conn->veto_list = NULL;
718 conn->hide_list = NULL;
719 conn->veto_oplock_list = NULL;
720 conn->aio_write_behind_list = NULL;
721
722 conn->read_only = lp_readonly(SNUM(conn));
723
724 if (*lp_force_user(snum)) {
725
726 /*
727 * Replace conn->server_info with a completely faked up one
728 * from the username we are forced into :-)
729 */
730
731 char *fuser;
732 struct auth_serversupplied_info *forced_serverinfo;
733
734 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
735 lp_servicename(snum));
736 if (fuser == NULL) {
737 *pstatus = NT_STATUS_NO_MEMORY;
738 goto err_root_exit;
739 }
740
741 status = make_serverinfo_from_username(
742 conn, fuser, conn->server_info->guest,
743 &forced_serverinfo);
744 if (!NT_STATUS_IS_OK(status)) {
745 *pstatus = status;
746 goto err_root_exit;
747 }
748
749 TALLOC_FREE(conn->server_info);
750 conn->server_info = forced_serverinfo;
751
752 conn->force_user = True;
753 DEBUG(3,("Forced user %s\n", fuser));
754 }
755
756 /*
757 * If force group is true, then override
758 * any groupid stored for the connecting user.
759 */
760
761 if (*lp_force_group(snum)) {
762
763 status = find_forced_group(
764 conn->force_user, snum, conn->server_info->unix_name,
765 &conn->server_info->ptok->user_sids[1],
766 &conn->server_info->utok.gid);
767
768 if (!NT_STATUS_IS_OK(status)) {
769 *pstatus = status;
770 goto err_root_exit;
771 }
772
773 /*
774 * We need to cache this gid, to use within
775 * change_to_user() separately from the conn->server_info
776 * struct. We only use conn->server_info directly if
777 * "force_user" was set.
778 */
779 conn->force_group_gid = conn->server_info->utok.gid;
780 }
781
782 conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
783
784 {
785 char *s = talloc_sub_advanced(talloc_tos(),
786 lp_servicename(SNUM(conn)),
787 conn->server_info->unix_name,
788 conn->connectpath,
789 conn->server_info->utok.gid,
790 conn->server_info->sanitized_username,
791 pdb_get_domain(conn->server_info->sam_account),
792 lp_pathname(snum));
793 if (!s) {
794 *pstatus = NT_STATUS_NO_MEMORY;
795 goto err_root_exit;
796 }
797
798 if (!set_conn_connectpath(conn,s)) {
799 TALLOC_FREE(s);
800 *pstatus = NT_STATUS_NO_MEMORY;
801 goto err_root_exit;
802 }
803 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
804 lp_servicename(snum)));
805 TALLOC_FREE(s);
806 }
807
808 /*
809 * New code to check if there's a share security descripter
810 * added from NT server manager. This is done after the
811 * smb.conf checks are done as we need a uid and token. JRA.
812 *
813 */
814
815 {
816 bool can_write = False;
817
818 can_write = share_access_check(conn->server_info->ptok,
819 lp_servicename(snum),
820 FILE_WRITE_DATA);
821
822 if (!can_write) {
823 if (!share_access_check(conn->server_info->ptok,
824 lp_servicename(snum),
825 FILE_READ_DATA)) {
826 /* No access, read or write. */
827 DEBUG(0,("make_connection: connection to %s "
828 "denied due to security "
829 "descriptor.\n",
830 lp_servicename(snum)));
831 *pstatus = NT_STATUS_ACCESS_DENIED;
832 goto err_root_exit;
833 } else {
834 conn->read_only = True;
835 }
836 }
837 }
838 /* Initialise VFS function pointers */
839
840 if (!smbd_vfs_init(conn)) {
841 DEBUG(0, ("vfs_init failed for service %s\n",
842 lp_servicename(snum)));
843 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
844 goto err_root_exit;
845 }
846
847 /* ROOT Activities: */
848 /* explicitly check widelinks here so that we can correctly warn
849 * in the logs. */
850 widelinks_warning(snum);
851
852 /*
853 * Enforce the max connections parameter.
854 */
855
856 if ((lp_max_connections(snum) > 0)
857 && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
858 lp_max_connections(snum))) {
859
860 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
861 lp_max_connections(snum), lp_servicename(snum)));
862 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
863 goto err_root_exit;
864 }
865
866 /*
867 * Get us an entry in the connections db
868 */
869 if (!claim_connection(conn, lp_servicename(snum), 0)) {
870 DEBUG(1, ("Could not store connections entry\n"));
871 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
872 goto err_root_exit;
873 }
874 claimed_connection = true;
875
876 /* Invoke VFS make connection hook - this must be the first
877 filesystem operation that we do. */
878
879 if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
880 conn->server_info->unix_name) < 0) {
881 DEBUG(0,("make_connection: VFS make connection failed!\n"));
882 *pstatus = NT_STATUS_UNSUCCESSFUL;
883 goto err_root_exit;
884 }
885
886 /* Any error exit after here needs to call the disconnect hook. */
887 on_err_call_dis_hook = true;
888
889 if ((!conn->printer) && (!conn->ipc)) {
890 conn->notify_ctx = notify_init(conn, procid_self(),
891 smbd_messaging_context(),
892 smbd_event_context(),
893 conn);
894 }
895
896 /*
897 * Fix compatibility issue pointed out by Volker.
898 * We pass the conn->connectpath to the preexec
899 * scripts as a parameter, so attempt to canonicalize
900 * it here before calling the preexec scripts.
901 * We ignore errors here, as it is possible that
902 * the conn->connectpath doesn't exist yet and
903 * the preexec scripts will create them.
904 */
905
906 (void)canonicalize_connect_path(conn);
907
908 /* Preexecs are done here as they might make the dir we are to ChDir
909 * to below */
910 /* execute any "root preexec = " line */
911 if (*lp_rootpreexec(snum)) {
912 char *cmd = talloc_sub_advanced(talloc_tos(),
913 lp_servicename(SNUM(conn)),
914 conn->server_info->unix_name,
915 conn->connectpath,
916 conn->server_info->utok.gid,
917 conn->server_info->sanitized_username,
918 pdb_get_domain(conn->server_info->sam_account),
919 lp_rootpreexec(snum));
920 DEBUG(5,("cmd=%s\n",cmd));
921 ret = smbrun(cmd,NULL);
922 TALLOC_FREE(cmd);
923 if (ret != 0 && lp_rootpreexec_close(snum)) {
924 DEBUG(1,("root preexec gave %d - failing "
925 "connection\n", ret));
926 *pstatus = NT_STATUS_ACCESS_DENIED;
927 goto err_root_exit;
928 }
929 }
930
931 /* USER Activites: */
932 if (!change_to_user(conn, conn->vuid)) {
933 /* No point continuing if they fail the basic checks */
934 DEBUG(0,("Can't become connected user!\n"));
935 *pstatus = NT_STATUS_LOGON_FAILURE;
936 goto err_root_exit;
937 }
938
939 effuid = geteuid();
940 effgid = getegid();
941
942 /* Remember that a different vuid can connect later without these
943 * checks... */
944
945 /* Preexecs are done here as they might make the dir we are to ChDir
946 * to below */
947
948 /* execute any "preexec = " line */
949 if (*lp_preexec(snum)) {
950 char *cmd = talloc_sub_advanced(talloc_tos(),
951 lp_servicename(SNUM(conn)),
952 conn->server_info->unix_name,
953 conn->connectpath,
954 conn->server_info->utok.gid,
955 conn->server_info->sanitized_username,
956 pdb_get_domain(conn->server_info->sam_account),
957 lp_preexec(snum));
958 ret = smbrun(cmd,NULL);
959 TALLOC_FREE(cmd);
960 if (ret != 0 && lp_preexec_close(snum)) {
961 DEBUG(1,("preexec gave %d - failing connection\n",
962 ret));
963 *pstatus = NT_STATUS_ACCESS_DENIED;
964 goto err_root_exit;
965 }
966 }
967
968 #ifdef WITH_FAKE_KASERVER
969 if (lp_afs_share(snum)) {
970 afs_login(conn);
971 }
972 #endif
973
974 /*
975 * we've finished with the user stuff - go back to root
976 * so the SMB_VFS_STAT call will only fail on path errors,
977 * not permission problems.
978 */
979 change_to_root_user();
980 /* ROOT Activites: */
981
982 /*
983 * If widelinks are disallowed we need to canonicalise the connect
984 * path here to ensure we don't have any symlinks in the
985 * connectpath. We will be checking all paths on this connection are
986 * below this directory. We must do this after the VFS init as we
987 * depend on the realpath() pointer in the vfs table. JRA.
988 */
989 if (!lp_widelinks(snum)) {
990 if (!canonicalize_connect_path(conn)) {
991 DEBUG(0, ("canonicalize_connect_path failed "
992 "for service %s, path %s\n",
993 lp_servicename(snum),
994 conn->connectpath));
995 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
996 goto err_root_exit;
997 }
998 }
999
1000 /* Add veto/hide lists */
1001 if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1002 set_namearray( &conn->veto_list, lp_veto_files(snum));
1003 set_namearray( &conn->hide_list, lp_hide_files(snum));
1004 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1005 set_namearray( &conn->aio_write_behind_list,
1006 lp_aio_write_behind(snum));
1007 }
1008 status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1009 NULL, NULL, &smb_fname_cpath);
1010 if (!NT_STATUS_IS_OK(status)) {
1011 *pstatus = status;
1012 goto err_root_exit;
1013 }
1014
1015 /* win2000 does not check the permissions on the directory
1016 during the tree connect, instead relying on permission
1017 check during individual operations. To match this behaviour
1018 I have disabled this chdir check (tridge) */
1019 /* the alternative is just to check the directory exists */
1020
1021 if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1022 !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1023 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1024 DEBUG(0,("'%s' is not a directory, when connecting to "
1025 "[%s]\n", conn->connectpath,
1026 lp_servicename(snum)));
1027 } else {
1028 DEBUG(0,("'%s' does not exist or permission denied "
1029 "when connecting to [%s] Error was %s\n",
1030 conn->connectpath, lp_servicename(snum),
1031 strerror(errno) ));
1032 }
1033 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1034 goto err_root_exit;
1035 }
1036
1037 string_set(&conn->origpath,conn->connectpath);
1038
1039 /* Figure out the characteristics of the underlying filesystem. This
1040 * assumes that all the filesystem mounted withing a share path have
1041 * the same characteristics, which is likely but not guaranteed.
1042 */
1043
1044 conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1045
1046 /*
1047 * Print out the 'connected as' stuff here as we need
1048 * to know the effective uid and gid we will be using
1049 * (at least initially).
1050 */
1051
1052 if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1053 dbgtext( "%s (%s) ", get_remote_machine_name(),
1054 conn->client_address );
1055 dbgtext( "%s", srv_is_signing_active(smbd_server_conn) ? "signed " : "");
1056 dbgtext( "connect to service %s ", lp_servicename(snum) );
1057 dbgtext( "initially as user %s ",
1058 conn->server_info->unix_name );
1059 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1060 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1061 }
1062
1063 return(conn);
1064
1065 err_root_exit:
1066 TALLOC_FREE(smb_fname_cpath);
1067 /* We must exit this function as root. */
1068 if (geteuid() != 0) {
1069 change_to_root_user();
1070 }
1071 if (on_err_call_dis_hook) {
1072 /* Call VFS disconnect hook */
1073 SMB_VFS_DISCONNECT(conn);
1074 }
1075 if (claimed_connection) {
1076 yield_connection(conn, lp_servicename(snum));
1077 }
1078 if (conn) {
1079 conn_free(conn);
1080 }
1081 return NULL;
1082 }
1083
1084 /****************************************************************************
1085 Make a connection to a service.
1086 *
1087 * @param service
1088 ****************************************************************************/
1089
1090 connection_struct *make_connection(struct smbd_server_connection *sconn,
1091 const char *service_in, DATA_BLOB password,
1092 const char *pdev, uint16 vuid,
1093 NTSTATUS *status)
1094 {
1095 uid_t euid;
1096 user_struct *vuser = NULL;
1097 fstring service;
1098 fstring dev;
1099 int snum = -1;
1100 char addr[INET6_ADDRSTRLEN];
1101
1102 fstrcpy(dev, pdev);
1103
1104 /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1105 * root. */
1106 if (!non_root_mode() && (euid = geteuid()) != 0) {
1107 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1108 "(%u)\n", (unsigned int)euid ));
1109 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1110 }
1111
1112 if (conn_num_open(sconn) > 2047) {
1113 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1114 return NULL;
1115 }
1116
1117 if(lp_security() != SEC_SHARE) {
1118 vuser = get_valid_user_struct(sconn, vuid);
1119 if (!vuser) {
1120 DEBUG(1,("make_connection: refusing to connect with "
1121 "no session setup\n"));
1122 *status = NT_STATUS_ACCESS_DENIED;
1123 return NULL;
1124 }
1125 }
1126
1127 /* Logic to try and connect to the correct [homes] share, preferably
1128 without too many getpwnam() lookups. This is particulary nasty for
1129 winbind usernames, where the share name isn't the same as unix
1130 username.
1131
1132 The snum of the homes share is stored on the vuser at session setup
1133 time.
1134 */
1135
1136 if (strequal(service_in,HOMES_NAME)) {
1137 if(lp_security() != SEC_SHARE) {
1138 DATA_BLOB no_pw = data_blob_null;
1139 if (vuser->homes_snum == -1) {
1140 DEBUG(2, ("[homes] share not available for "
1141 "this user because it was not found "
1142 "or created at session setup "
1143 "time\n"));
1144 *status = NT_STATUS_BAD_NETWORK_NAME;
1145 return NULL;
1146 }
1147 DEBUG(5, ("making a connection to [homes] service "
1148 "created at session setup time\n"));
1149 return make_connection_snum(sconn,
1150 vuser->homes_snum,
1151 vuser, no_pw,
1152 dev, status);
1153 } else {
1154 /* Security = share. Try with
1155 * current_user_info.smb_name as the username. */
1156 if (*current_user_info.smb_name) {
1157 fstring unix_username;
1158 fstrcpy(unix_username,
1159 current_user_info.smb_name);
1160 map_username(sconn, unix_username);
1161 snum = find_service(unix_username);
1162 }
1163 if (snum != -1) {
1164 DEBUG(5, ("making a connection to 'homes' "
1165 "service %s based on "
1166 "security=share\n", service_in));
1167 return make_connection_snum(sconn,
1168 snum, NULL,
1169 password,
1170 dev, status);
1171 }
1172 }
1173 } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1174 && strequal(service_in,
1175 lp_servicename(vuser->homes_snum))) {
1176 DATA_BLOB no_pw = data_blob_null;
1177 DEBUG(5, ("making a connection to 'homes' service [%s] "
1178 "created at session setup time\n", service_in));
1179 return make_connection_snum(sconn,
1180 vuser->homes_snum,
1181 vuser, no_pw,
1182 dev, status);
1183 }
1184
1185 fstrcpy(service, service_in);
1186
1187 strlower_m(service);
1188
1189 snum = find_service(service);
1190
1191 if (snum < 0) {
1192 if (strequal(service,"IPC$") ||
1193 (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1194 DEBUG(3,("refusing IPC connection to %s\n", service));
1195 *status = NT_STATUS_ACCESS_DENIED;
1196 return NULL;
1197 }
1198
1199 DEBUG(3,("%s (%s) couldn't find service %s\n",
1200 get_remote_machine_name(),
1201 client_addr(get_client_fd(),addr,sizeof(addr)),
1202 service));
1203 *status = NT_STATUS_BAD_NETWORK_NAME;
1204 return NULL;
1205 }
1206
1207 /* Handle non-Dfs clients attempting connections to msdfs proxy */
1208 if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0')) {
1209 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1210 "(pointing to %s)\n",
1211 service, lp_msdfs_proxy(snum)));
1212 *status = NT_STATUS_BAD_NETWORK_NAME;
1213 return NULL;
1214 }
1215
1216 DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1217
1218 return make_connection_snum(sconn, snum, vuser,
1219 password,
1220 dev, status);
1221 }
1222
1223 /****************************************************************************
1224 Close a cnum.
1225 ****************************************************************************/
1226
1227 void close_cnum(connection_struct *conn, uint16 vuid)
1228 {
1229 file_close_conn(conn);
1230
1231 if (!IS_IPC(conn)) {
1232 dptr_closecnum(conn);
1233 }
1234
1235 change_to_root_user();
1236
1237 DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1238 get_remote_machine_name(),
1239 conn->client_address,
1240 lp_servicename(SNUM(conn))));
1241
1242 /* Call VFS disconnect hook */
1243 SMB_VFS_DISCONNECT(conn);
1244
1245 yield_connection(conn, lp_servicename(SNUM(conn)));
1246
1247 /* make sure we leave the directory available for unmount */
1248 vfs_ChDir(conn, "/");
1249
1250 /* execute any "postexec = " line */
1251 if (*lp_postexec(SNUM(conn)) &&
1252 change_to_user(conn, vuid)) {
1253 char *cmd = talloc_sub_advanced(talloc_tos(),
1254 lp_servicename(SNUM(conn)),
1255 conn->server_info->unix_name,
1256 conn->connectpath,
1257 conn->server_info->utok.gid,
1258 conn->server_info->sanitized_username,
1259 pdb_get_domain(conn->server_info->sam_account),
1260 lp_postexec(SNUM(conn)));
1261 smbrun(cmd,NULL);
1262 TALLOC_FREE(cmd);
1263 change_to_root_user();
1264 }
1265
1266 change_to_root_user();
1267 /* execute any "root postexec = " line */
1268 if (*lp_rootpostexec(SNUM(conn))) {
1269 char *cmd = talloc_sub_advanced(talloc_tos(),
1270 lp_servicename(SNUM(conn)),
1271 conn->server_info->unix_name,
1272 conn->connectpath,
1273 conn->server_info->utok.gid,
1274 conn->server_info->sanitized_username,
1275 pdb_get_domain(conn->server_info->sam_account),
1276 lp_rootpostexec(SNUM(conn)));
1277 smbrun(cmd,NULL);
1278 TALLOC_FREE(cmd);
1279 }
1280
1281 conn_free(conn);
1282 }
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